There was Bryan Cranston, sporting a mustache and a full head of hair, chatting at intermission. Helen Mirren and Taylor Hackford walked the red carpet too. Opening nighters could also spot Christoph Waltz, not to mention Anson Elgort and Olivia Wilde. Gloria Estefan, at work on a Broadway show of her own, made the rounds too.

They all turned up to see “Finding Neverland,” the passion project for Weinstein that, after a tumultuous road to New York, finally opened on Broadway April 15 in a production that stars Matthew Morrison and Kelsey Grammer. Weinstein joined the cast onstage to take a bow at the curtain call, alongsi...